Golang Stream.Close方法代码示例

// Accepts an incoming tunneling request from a remote, initializes and stores
// the new tunnel into the connection state.
func (c *Connection) buildTunnel(remote uint64, id uint64, key []byte, addrs []string, timeout time.Duration) (*Tunnel, error) {
	deadline := time.Now().Add(timeout)

	// Create the local tunnel endpoint
	c.tunLock.Lock()
	tunId := c.tunIdx
	tun := &Tunnel{
		id:    tunId,
		owner: c,
		term:  make(chan struct{}),
	}
	c.tunIdx++
	c.tunLive[tunId] = tun
	c.tunLock.Unlock()

	// Dial the remote tunnel listener
	var err error
	var strm *stream.Stream
	for _, addr := range addrs {
		strm, err = stream.Dial(addr, timeout)
		if err == nil {
			break
		}
	}
	// If no error occurred, initialize the client endpoint
	if err == nil {
		var conn *link.Link
		conn, err = c.initClientTunnel(strm, remote, id, key, deadline)
		if err != nil {
			if err := strm.Close(); err != nil {
				log.Printf("iris: failed to close uninitialized client tunnel stream: %v.", err)
			}
		} else {
			// Make sure the tunnel wasn't terminated since (init/close race)
			tun.lock.Lock()
			select {
			case <-tun.term:
				conn.Close()
				err = ErrTerminating
			default:
				tun.conn = conn
			}
			tun.lock.Unlock()
		}
	}
	// Tunneling failed, clean up and report error
	if err != nil {
		c.tunLock.Lock()
		delete(c.tunLive, tunId)
		c.tunLock.Unlock()
		return nil, err
	}
	return tun, nil
}

// Server side of the STS session negotiation.
func (l *Listener) serverHandle(strm *stream.Stream, timeout time.Duration) {
	// Make sure the authentication is synced with the sink
	defer l.pendWait.Done()

	// Set an overall time limit for the handshake to complete
	strm.Sock().SetDeadline(time.Now().Add(config.SessionShakeTimeout))
	defer strm.Sock().SetDeadline(time.Time{})

	// Fetch the session request and multiplex on the contents
	req := new(initRequest)
	if err := strm.Recv(req); err != nil {
		log.Printf("session: failed to retrieve initiation request: %v", err)
		if err = strm.Close(); err != nil {
			log.Printf("session: failed to close uninitialized stream: %v.", err)
		}
		return
	}
	switch {
	case req.Auth != nil:
		// Authenticate and clean up if unsuccessful
		secret, err := l.serverAuth(strm, req.Auth)
		if err != nil {
			log.Printf("session: failed to authenticate remote stream: %v.", err)
			if err = strm.Close(); err != nil {
				log.Printf("session: failed to close unauthenticated stream: %v.", err)
			}
			return
		}
		// Create the session and link a data channel to it
		sess := newSession(strm, secret, true)
		if err = l.serverLink(sess); err != nil {
			log.Printf("session: failed to retrieve data link: %v.", err)
			if err = strm.Close(); err != nil {
				log.Printf("session: failed to close unlinked stream: %v.", err)
			}
			return
		}
		// Session setup complete, send upstream
		select {
		case l.Sink <- sess:
			// Ok
		case <-time.After(timeout):
			log.Printf("session: established session not handled in %v, dropping.", timeout)
			if err = sess.Close(); err != nil {
				log.Printf("session: failed to close established session: %v.", err)
			}
		}
	case req.Link != nil:
		// Extract the temporary session id and link this stream to it
		l.pendLock.Lock()
		res, ok := l.pends[req.Link.Id]
		l.pendLock.Unlock()

		if ok {
			select {
			case res <- strm:
				// Ok, link succeeded
			default:
				log.Printf("session: established data stream not handled.")
				if err := strm.Close(); err != nil {
					log.Printf("session: failed to close established data stream: %v.", err)
				}
			}
		}
	}
}